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54e54c6877
mostly changes of / operators into //. Once or twice I did more or less than recommended.
77 lines
1.9 KiB
Python
Executable file
77 lines
1.9 KiB
Python
Executable file
#! /usr/bin/env python
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"""Conversions to/from base64 transport encoding as per RFC-1521."""
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# Modified 04-Oct-95 by Jack to use binascii module
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import binascii
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__all__ = ["encode","decode","encodestring","decodestring"]
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MAXLINESIZE = 76 # Excluding the CRLF
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MAXBINSIZE = (MAXLINESIZE//4)*3
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def encode(input, output):
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"""Encode a file."""
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while 1:
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s = input.read(MAXBINSIZE)
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if not s: break
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while len(s) < MAXBINSIZE:
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ns = input.read(MAXBINSIZE-len(s))
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if not ns: break
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s = s + ns
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line = binascii.b2a_base64(s)
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output.write(line)
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def decode(input, output):
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"""Decode a file."""
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while 1:
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line = input.readline()
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if not line: break
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s = binascii.a2b_base64(line)
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output.write(s)
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def encodestring(s):
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"""Encode a string."""
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pieces = []
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for i in range(0, len(s), MAXBINSIZE):
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chunk = s[i : i + MAXBINSIZE]
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pieces.append(binascii.b2a_base64(chunk))
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return "".join(pieces)
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def decodestring(s):
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"""Decode a string."""
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return binascii.a2b_base64(s)
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def test():
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"""Small test program"""
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import sys, getopt
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'deut')
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except getopt.error, msg:
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sys.stdout = sys.stderr
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print msg
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print """usage: %s [-d|-e|-u|-t] [file|-]
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-d, -u: decode
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-e: encode (default)
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-t: encode and decode string 'Aladdin:open sesame'"""%sys.argv[0]
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sys.exit(2)
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func = encode
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for o, a in opts:
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if o == '-e': func = encode
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if o == '-d': func = decode
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if o == '-u': func = decode
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if o == '-t': test1(); return
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if args and args[0] != '-':
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func(open(args[0], 'rb'), sys.stdout)
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else:
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func(sys.stdin, sys.stdout)
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def test1():
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s0 = "Aladdin:open sesame"
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s1 = encodestring(s0)
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s2 = decodestring(s1)
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print s0, `s1`, s2
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if __name__ == '__main__':
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test()
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